Centimeters to Millimeters (cm to mm) Converter

Enter centimeters to get millimeters. Multiplying by 10 moves the decimal point one place to the right.

1 cm = 10 mm

From
To
10
Try:
Step-by-stepcm โ†’ mm
11 cm = 10 mmformula
21 ร— 10substitute
310 mmresult
URLiunitconverter.com/length/centimeters-to-millimeters?value=1Open
1 cm in every unit
mm
Millimeter
1 mm = 0.1 cm
10 mm
cm
Centimeter
1 cm = 10 mm
1 cm
m
Meter
SI base unit
0.01 m
km
Kilometer
1 km = 1,000 m
0.00001 km
in
Inch
1 in = 2.54 cm exactly
0.39370079 in
ft
Foot
1 ft = 12 in
0.032808399 ft
yd
Yard
1 yd = 3 ft
0.010936133 yd
mi
Mile
1 mi = 5,280 ft
0.0000062137119 mi

Centimeters to Millimeters Formula

millimeters = centimeters ร— 10

One centimeter is 10 millimeters, by definition, so the conversion is exact. For example, 2.5 cm ร— 10 = 25 mm.

Reading a Metric Ruler

The numbered marks on a metric ruler are centimeters and the small ticks between them are millimeters. To read 3 cm plus 4 ticks, write 34 mm, or 3.4 cm.

Paper and Card Sizes

ItemCentimetersMillimeters
A4 paper21 ร— 29.7 cm210 ร— 297 mm
A5 paper14.8 ร— 21 cm148 ร— 210 mm
Bank card (ISO ID-1)8.56 ร— 5.398 cm85.6 ร— 53.98 mm
Postcard (A6)10.5 ร— 14.8 cm105 ร— 148 mm

Centimeters to Millimeters Table

Centimeters (cm)Millimeters (mm)
0.1 cm1 mm
0.2 cm2 mm
0.5 cm5 mm
1 cm10 mm
1.5 cm15 mm
2 cm20 mm
2.5 cm25 mm
3 cm30 mm
5 cm50 mm
10 cm100 mm
15 cm150 mm
20 cm200 mm
30 cm300 mm
50 cm500 mm
100 cm1,000 mm

Common Questions

How do I convert cm to mm?
Multiply by 10.
What is 1.5 cm in mm?
1.5 cm is 15 mm.
How many mm are in 10 cm?
10 cm is 100 mm.
Why do some products list sizes in mm and others in cm?
Technical and engineering specifications usually use mm. Clothing, furniture and everyday measurements often use cm.